If you teach middle or high school ESL, you probably realize that the language doesn't evolve as readily as it does for children. One problem that sometimes occurs is that students transfer rules from their native language to English. For this reason, explicitly teaching grammar is sometimes necessary and extremely useful -- so that your kids sound educated when they are off to apply to college or search for jobs one day.
How can this PowerPoint be used? It can supplement a mainstream class that includes ELL's, in the event that you notice one or more student making double negative errors. If that is the case, you can have individual students view the PowerPoint at computer stations or you can show it to the whole class for practice. The PowerPoint can also be used as a whole class activity with teacher or students going to the board to make corrections before seeing the right answer. Please note that if you have students who are very beginning writers, you might want to also purchase the corresponding double negative note sheet. It contains much of the same information.
Finally, let me offer a confession. This PowerPoint is for students who already speak at least a little English. If you have any true newcomers in your class, you'll need to offer on-the-spot drawings, pictures, gestures, charades, or some other vehicle for communicating the language to them. Usually my PowerPoints offer clear visuals, but I created this one for students who already demonstrate limited skills in this area.
In any case, I hope that this will help your learners to understand how to avoid double negatives.